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Modern Periodic Law

The atomic nu...

Question

The atomic number of aluminium (Al) is 13, and its mass number is 27. The total number of neutrons in an Al atom is.

A

15

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B

13

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C

14

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Solution

The correct option is C 14
Given:
Atomic number of aluminium, Z = 13
Mass number of aluminium, A = 27
$⟹$ Number of neutrons in aluminium = (A - Z) = 27 - 13 = 14.

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